http://www.r6andup.com/playboy.html#

The example is the 50 Pence London Playboy Chip ( just got in today, Thanks Zhongshi ) , its at the top of the page under the Training Chips , simply put your mouse over the image and then you will see the watermark , alond with the reverse image of the chip. This is a good way to prevent right click stealing but would not prevent someone from stealing the image via print screen.